RadChem 2010

Session

Chemistry of Actinide and Trans-actinide Elements 1

TAn1

19 Apr 2010, 08:00

Casino Conference Centre

286. New nucleus ²⁷⁷Hs: in between two islands of stability

Prof. Andreas Türler (Paul Scherrer Institute and Bern University, CH-5232 VILLIGEN PSI, SWITZERLAND)

19/04/2010, 08:00

Chemistry of Actinide and Trans-actinide Elements

Verbal

The nuclear fusion reactions 244-Pu(48-Ca,3n)289-114 and 244-Pu(48-Ca, 4n)288-114 were studied at the new, highly efficient gas-filled recoil separator TASCA. The large number of thirteen observed decay chains assigned to 288-114 and 289-114 enabled reliable cross sections measurements. The highest cross section was 8.2 (+4.0 / -2.8) pb measured for the 4n evaporation channel. The new...

282. Chemical identification of element 114 at TASCA

Dr Alexander Yakushev (Institute for Radiochemistry TU Munich)

19/04/2010, 08:15

Chemistry of Actinide and Trans-actinide Elements

Verbal

The newly built gas-filled separator TASCA, at the GSI Darmstadt has been successfully commissioned. TASCA was designed to study the physics and chemistry of the heaviest element and it has been demonstrated that TASCA is the most efficient device for the production of superheavy elements in complete fusion reactions with a 48Ca ion beam. Two experiments on the physics and chemistry of element...

252. Independent verification of element 114

Dr Jan Dvorak (Helmholtz Institute Mainz)

19/04/2010, 08:30

Chemistry of Actinide and Trans-actinide Elements

Verbal

Production of numerous superheavy elements (SHE) in ⁴⁸Ca irradiations of actinide targets was reported by the Dubna Gas Filled Recoil Separator (DGFRS) group in past years [1]. Independent verification of these observations has been of paramount importance, but confirmation experiments failed to produce SHE in ⁴⁸Ca induced reactions. We report on the first successful...

133. Element 114 chemistry and what is next?

Mr Alexey Serov (PhD Student)

19/04/2010, 08:45

Chemistry of Actinide and Trans-actinide Elements

Verbal

Based on the order in periodic table, element 114 should be placed in the group 14, which includes such elements like C, Si, Ge, and Pb. It can be expected by the law of periodicity that E114 will reveal a more metallic behaviour than its lighter homologues. However, relativistic quantum chemical calculations predict different chemical behaviour, namely, higher inertness in comparison with...

172. Vacuum thermochromatography - theory and Monte Carlo simulation

Prof. Ivo Zvara (Flerov Laboratory of Nuclear Reactions, Joint Institute of Nuclear Research,)

19/04/2010, 09:00

Chemistry of Actinide and Trans-actinide Elements

Verbal

Vacuum Thermochromatography – Theory and Monte Carlo Simulation Mixtures of ultra low amounts of species can be separated in a tube, evacuated well below a microbar, along which the temperature gradually decreases from the closed hot end, by placing the sample into this hot end (zero coordinate). Then the Knudsen flow results in that the components with dissimilar adsorbability on the...

143. Gas phase chemical studies of superheavy elements using the Dubna Gas-Filled Recoil Separator – stopping range determination

Mr David Wittwer (University of Bern / Paul Scherrer Institut)

19/04/2010, 09:15

Chemistry of Actinide and Trans-actinide Elements

Verbal

The use of the Dubna Gas-Filled Recoil Separator (DGFRS) [1] as a preseparation device for gas phase chemistry experiments with elements 112 and 114 led us to the task of reevaluating the stopping force (STF) of superheavy elements (SHE). In the experiment the DGFRS and the IVO-system [2] were separated by a thin Mylar window of variable thickness so that the evaporation residues (EVR) can...